Non-Polar and Semi-Polar Bulk Gallium Nitride (GaN) Substrates

Semiconductor epitaxy is best performed on native substrates in order to minimize interface effects and defect formation. Gallium nitride epitaxy on Kyma GaN substrates greatly improves a number of important device properties of subsequent GaN epitaxy when compared with heteroepitaxial GaN on SiC, sapphire, or silicon. The benefits in lattice constant mismatch, dislocation density and thermal conductivity can be seen in the table below.

Bulk GaN vs Non-native Substrates
 GaN on Bulk GaNGaN on SiCGaN on sapphireGaN on Silicon
Lattice Constant Mismatch 0% 3.5% mismatch 14% mismatch 17% mismatch
Dislocation Density 104 - 5 x 106 / cm2 1 x 109 / cm2 5 x 109 / cm2 1 x 1011 / cm2
Thermal Conductivity 2.5 W/cm-K 1.3 W/cm-K 1.2 W/cm-K 1.0 W/cm-K
Kyma does not currently sell epitaxy on Bulk GaN. The data listed here is from a wide variety of customer reported epitaxy results.

 

Kyma's high purity GaN substrate allows GaN-based device manufacturers to eliminate interlayers, processing steps, and improve device quality over those grown on any other substrate. Detailed product descriptions and specification sheets are listed below.

All substrates have a typical dislocation density of  ≤ 5x106 / cm2 and epi-ready surface finish.

Specification Sheets

Non-Polar Bulk GaN Substrate Specification Sheet

  • Grades:  Production, research and rider
  • Sizes:  5mm x 10mm and irregular
  • Sizes:  475+25um and custom
  • Orientations:  m-plane and a-plane

Semi-Polar Bulk GaN Substrate Specification Sheet

  • Grades:  Production, research and rider
  • Sizes:  5mm x 10mm and irregular
  • Sizes:  475+25um and custom
  • Orientations:  10-11, 10-12, 10-13, 20-21, 11-22

Kyma Terms and Conditions